chemical engineering Mcqs
5251. _____________ is not a polyester fiber?
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A. Dacron

B. Terylene

C. Polyacrylonitrile

D. Nylon
5252. In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the_________________?
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A. Hexamethylene diamine and the ring

B. Hexamethylene diamine and the adipic acid

C. None of these

D. Adipic acid and the ring

5253. A copolymer of vinyl and vinylidene chloride is called_____________________?
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A. Treylene

B. Saran

C. Orlon

D. Dacron

5254. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?
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A. Ammonium alum

B. Potassium alum

C. Both A. & B.

D. Neither A. nor B.

5255. Which of the following has the weakest intermolecular forces ?
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A. Polyisoprene

B. Bakelite

C. Polystyrene

D. Nylon-66

5256. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?
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A. Flexibility

B. All A., B. & C.

C. Tensile strength

D. Chemical resistance

5257. Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is_________________?
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A. Chloroethane

B. Isoprene

C. None of these

D. Chloroprene
5258. Pick out the wrong statement ?
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A. Gasoline having an octane number of 90 can be produced by alkylation process

B. All the alkylation processes use very high temperature (> 1000C)

C. Alkylation produces a larger iso-paraffin (having higher octane number) from the reaction of an olefin with smaller iso-paraffin

D. Catalytic alkylation processes use HF, AlCl3 & H2SO4 as Catalysts

5259. Bakelite (phenol-formaldehyde) resin cannot be used as________________?
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A. Electrical insulation

B. Decorative laminates

C. Decorative paint

D. Glass reinforced plastics

5260. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?
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A. Polyamides

B. Phenol formaldehyde resins

C. Polyesters

D. Cross linked polystyrene
5261. Nylon-6 is a_________________?
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A. None of these

B. Thermosetting resin

C. Polyester

D. Polyamide
5262. Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is__________________?
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A. 1 kgf/cm2 (gage) and 70C

B. 1000 kgf/cm2 and 100C

C. 7 kgf/cm2 and 700C

D. 7 kgf/cm2 and 70 C
5263. Tubeless tyres are made of ______________ rubber, which is a co-polymer of isoprene & isobutylene?
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A. Butyl

B. Silicone

C. Neoprene

D. Nitrile

5264. Main constituent of the gas produced from a gobar gas plant is___________________?
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A. H2

B. CH4

C. CO2

D. CO

5265. Caking index of a coal is a measure of its _______________________?
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A. Porosity

B. Agglutinating (binding) properties

C. Reactivity

D. Abradability

5266. Gutta percha rubber is_________________?
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A. An isomer of natural rubber

B. Soft & tacky at room temperature

C. Recovered by coagulation of rubber latex

D. A thermosetting resin

5267. A good metallurgical coke___________________?
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A. Should have high porosity

B. Should be brittle

C. Must contain moderate quantities of ash, moisture, sulphur and volatile matters

D. Should have low fusion point of its ash

5268. The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be___________________?
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A. 42.9

B. 27.6

C. 23

D. 47.3

5269. Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ C for producing nylon-6?
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A. -20 to 25

B. 50 to 75

C. 250-280

D. 100 to 150

5270. Cross linked polymers are__________________?
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A. Thermosetting

B. Fibres only

C. Thermoplastic

D. Either A. or B.

5271. Neoprene is a___________________?
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A. None of these

B. Synthetic rubber

C. Monomer

D. Polyester

5272. Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the____________________?
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A. Absorption of gases and vapor

B. Solvent recovery from air and gases

C. Electrode manufacture

D. Decolourisation of sugar

5273. Wind loss resulting from unscientific storage of coal may be the order of about _____________ percent?
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A. 14.5

B. 2.5

C. 10.5

D. 7.5

5274. Bulk density of pulverised coal may be about ______________ kg/m3?
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A. 1000

B. 1500

C. 100

D. 500
5275. The cuprous chloride used in orsat apparatus can absorb___________________?
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A. Only CO

B. Both CO and CO2

C. Both CO and O2

D. All CO, CO2, and O2
5276. Polymers are_________________?
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A. Micro-molecules

B. None of these

C. Sub-micromolecules

D. Macromolecules
5277. The major component of acrylic fibers is__________________?
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A. Polyolefins

B. Polyesters

C. Polyamides

D. Polyacrylonitrile
5278. Calorific value of blast furnace gas is around _____________ KCal/Nm3?
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A. 6500

B. 1800

C. 850

D. 4200

5279. ________________ is produced by polymerisation of chloroprene?
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A. Polyurethane rubber

B. Neoprene

C. Butyl rubber

D. Thiokol (a polysulphide rubber)

5280. Presence of free moisture in coal is most disadvantageous during_________________?
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A. Its pulverisation (as it requires more power)

B. Handling (e.g. when emptying wagons)

C. None of these

D. Combustion of fire slacks on the grates

5281. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________C?
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A. 105

B. 85

C. 145

D. 70

5282. Plexiglass (also called Lucite) because of its high optical transparency is used for making lenses. It is chemically_________________?
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A. Polycarbonates

B. Polymethyl methacrylate (PMMA)

C. Phenolic resins

D. Polytetrafluroethylene (PTFE)

5283. _____________ is a thermosetting plastic ?
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A. PVC

B. Polythene

C. Bakelite

D. Polystyrene

5284. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?
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A. Sinter making

B. Iron blast furnace

C. Domestic ovens

D. Cupola in foundries

5285. Most of the plastics are safe to be used upto a maximum temperature of ______________ C?
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A. 450

B. 150

C. 100

D. 350

5286. Which of the following is a natural polyamide fiber?
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A. Wool

B. Silk

C. None of these

D. Cotton

5287. The shift conversion reaction taking place during water gas manufacture is given by__________________?
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A. CO + H2O ? CO2 + H2

B. None of these

C. C + 2H2O ? CO2 + 2H2

D. C + H2O ? CO + H2

5288. Styrene butadiene rubber is commercially manufactured by__________________?
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A. Emulsion polymerisation

B. Suspension polymerisation

C. Bulk polymerisation

D. Solution polymerisation

5289. Which of the following is the lowest cost plastic commercially available ?
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A. Teflon

B. Bakelite

C. Polythene

D. PVC

5290. The generic chemical name for the class of polymers which are commercially known as nylons is______________________?
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A. Polyacrylate

B. Polyamide

C. Polyurethane

D. Polyolefins

5291. For every 10% increase in the excess air; the fuel consumption increases by _______________ percent?
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A. 1

B. 0.1

C. 0.2

D. 0.5

5292. L.D. converter gas (produced in steel plant) comprises mainly of ___________________?
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A. CO2 & H2

B. CO (upto 65%) & CO2

C. CO2 & O2

D. CO & O2

5293. Benzoyl chloride is not used as a catalyst in the manufacture of___________________?
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A. Polypropylene

B. Polystyrene

C. Polyvinyl acetate

D. Polyvinyl chloride-co-vinyl acetate

5294. Main constituent of natural rubber is_________________?
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A. Polystyrene

B. Polybutadiene

C. Polyisoprene

D. Poly chloroprene

5295. Trade name of ______________ is neoprene?
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A. Polychlorophrene

B. Poly vinyl acetate

C. Polyisoprene

D. Polytetrafluoroethylene

5296. Thermal pyrolysis of ethylene dichloride produces ____________________?
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A. Ethylene oxide

B. Vinyl chloride

C. Ethanol amine

D. Trichloroethylene

5297. Which of the following is not endothermic ?
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A. Cracking

B. Gasification

C. Partial oxidation

D. Reforming

5298. Nylon-66 compared to nylon-6 has __________________?
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A. rasion resistant properties

B. All A., B. and C.

C. Higher hardness

D. Lower melting point

5299. Plastic articles are normally produced by _____________ moulding?
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A. Dry sand

B. Green sand

C. Injection

D. Shell

5300. Nitrogen in coal_________________?
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A. Is recovered as ammonia during its carbonisation

B. Is present upto 1-2%

C. All A., B. and C.

D. Comes from protein in parent vegetable matter